The structure of the dental handpiece

Dental handpieces are classified into two types: ball bearing type and air bearing type, according to the different working methods of the bearings used.

Ball bearing type high-speed handpiece is mainly composed of handpiece, handle and dental handpiece connector.

1. The internal structure of the machine head

The vortex core rotor is the core component of the machine head. It is composed of a bearing, a wind wheel and a mandrel. There are upper and lower miniature bearings in the machine head. The bearing is cushioned with an O-shaped rubber ring to keep the bur at high speed. Radial and axial concentricity during rotation, and reduces operating noise and vibration.

2. Clamping method of bur

There are various ways for the machine head to clamp the bur. In the early days, the reed-type clamp was used, that is, there were 3 evenly divided bow-shaped reeds in the mandrel. The bur handle is inserted into it, and the reed is deformed by force to clamp the needle handle.

Nowadays, screw-type and pressing-type bur clamping methods are mostly used. The clamping sleeve of this dental handpiece has an elastic three-lobed clamping spring. The clamping spring is in the shape of a hammer and has three axial grooves. Or press the top spring to open or lock the clamp spring to hold the bur.

3. Spray structure

There is a water pipe and a gas pipe at the tail of the turbine dental handpiece. The water and gas are mixed at the outlet of the handpiece and sprayed out from the spray hole in the form of a mist.

4. Dental handpiece connector

The dental handpiece connector is the connection between the handpiece and the output hose of the main unit. The main air flow that drives the rotation of the dental handpiece wind wheel and the branch air that generates atomization enter the main air hole, branch hole and water hole of the dental handpiece connector through the pipeline respectively. Dental handpiece. There are two ways of connection between the handpiece and the handpiece connector: one is with a fixed lock nut on the handpiece connector, and the other is with a quick-release connector.

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